Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d8918d10eb355f92192ccc02baa0cf18015776cd2053c1823296d1e4bbb2cb' 
  AND token = '3KjTV1CAWWQa6hMXyLdHyKJMDP0J+hagDYnEdolC3Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}